9DB433

FOUR OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1–3

IDT®

FOUR OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1–3

11

9DB433

MAY 25, 2018

SMBus Table: Frequency Select Register, READ/WRITE ADDRESS (Selectable)

Pin #

Name

Control Function

Type0

1

Default

Bit 7

PD_Mode

PD# drive mode

RW

driven

Hi-Z

1

Bit 6

OE_Mode

OE#_Stop drive mode

RW

driven

Hi-Z

0

Bit 5

0

Bit 4

X

Bit 3

MODE1

BYPASS#/PLL1

RW

Latched

Bit 2

1

Bit 1

MODE0

BYPASS#/PLL0

RW

Latched

Bit 0

SRC_DIV#

SRC Divide by 2 Select

RW

x/2

x/1

1

SMBus Table: Output Control Register

Pin #

Name

Control Function

Type0

1

Default

Bit 7

1

Bit 6

DIF_6

Output Enable

RW

Disable

Enable

1

Bit 5

DIF_5

Output Enable

RW

Disable

Enable

1

Bit 4

1

Bit 3

1

Bit 2

DIF_2

Output Enable

RW

Disable

Enable

1

Bit 1

DIF_1

Output Enable

RW

Disable

Enable

1

Bit 0

1

NOTE: The SMBus Output Enable Bit must be '1' AND the respective OE pin must be active for the output to run!

SMBus Table: OE Pin Control Register

Pin #

Name

Control Function

Type0

1

Default

Bit 7

0

Bit 6

DIF_6

DIF_6 Stoppable with OE6#

RW

Free-run

Stoppable

0

Bit 5

DIF_5

DIF_5 Stoppable with OE5#

RW

Free-run

Stoppable

0

Bit 4

0

Bit 3

0

Bit 2

DIF_2

DIF_2 Stoppable with OE2#

RW

Free-run

Stoppable

0

Bit 1

DIF_1

DIF_1 Stoppable with OE1#

RW

Free-run

Stoppable

0

Bit 0

0

SMBus Table: Reserved Register

Pin #

Name

Control Function

Type0

1

Default

Bit 7

X

Bit 6

X

Bit 5

X

Bit 4

X

Bit 3

X

Bit 2

X

Bit 1

X

Bit 0

X

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

6,7

Reserved

Byte 3

Reserved

Reserved

Reserved

NOTE: Only OE1# and OE6# are available on 28-TSSOP/SSOP packages. If you wish the default to be "Stoppable" see the 9DB434.

19,20

9,10

Reserved

6,7

22,23

Byte 1

9,10

Byte 2

Byte 0

-

-

-

-

-

Reserved

22,23

19,20

-

-

-

See Operating Mode

Readback Table

See Operating Mode

Readback Table

Reserved

Reserved